Possible origin of CMB temperature fluctuations: Vacuum fluctuations of Kaluza-Klein and string states during inflationary era

Дата и время публикации : 2011-10-25T01:33:06Z

Авторы публикации и институты :
Yoshinobu Habara
Hikaru Kawai
Masao Ninomiya
Yasuhiro Sekino

Ссылка на журнал-издание: Phys. Rev. D 85, 104027 (2012)
Коментарии к cтатье: 32 pages, 7 figures; v2: Corrected minor misprints in Appendix. Added references; v3: Added discussion about reheating in Subsection 5.1. Added references. Final version to appear in PRD
Первичная категория: hep-th

Все категории : hep-th, astro-ph.CO, gr-qc

Краткий обзор статьи: We point out that the temperature fluctuations of cosmic microwave background (CMB) can be generated in a way that is different from the one usually assumed in slow-roll inflation. Our mechanism is based on vacuum fluctuations of fields which are at rest at the bottom of the potential, such as Kaluza-Klein modes or string excited states. When there are a large number (typically of order $Nsim 10^{14}$) of fields with small mass in unit of Hubble parameter during the inflationary era, this effect can give significant contributions to the CMB temperature fluctuations. This number $N$ makes it possible to enhance scalar perturbation relative to tensor perturbation. Comparison with the observed amplitudes suggests that models with string scale of order $10^{-5}$ of 4D Planck scale are favorable.

Category: Physics